At least 37 homes were destroyed in two Japan villages, and 39 people were injured across the region, including seven seriously, mostly with broken bones, CNN reported.
The magnitude-6.7 earthquake struck shortly after 10 p.m. Saturday west of Nagano city at a depth of 6 miles, the Japan Meteorological Agency said, according to CNN. The quake was followed by more than 45 aftershocks.
Japan's Nuclear Regulation Authority said no abnormalities were reported at three nuclear power plants in the affected areas, CNN reported.
The hardest-hit area appeared to be Hakuba, which hosted events in the 1998 games, according to Reuters. At least 30 homes were destroyed, and 17 people injured.
All of Japan's nuclear plants are offline following a magnitude-9.0 earthquake and massive tsunami in 2011 that sent three reactors at the Fukushima Dai-ichi plant into meltdown, Reuters reported.
A landslide spilled onto a railroad track, forcing service to stop and about 200 people have evacuated to shelters, almost all from Hakuba and Otari, according to Reuters.
All 21 people trapped under collapsed houses were rescued, with two of them injured, the National Police Agency told Japan's Kyodo news agency, CNN reported.
Shinkansen bullet train service in the region was restored after a short interruption, according to CNN. Chubu Electric Power Co. said 200 homes were still without power on Sunday.
